Suìyuè rúsuō, zhuǎnyǎnjiān háizi men dōu zhǎngdà le.
Time flies like a shuttle - in the blink of an eye, the children have all grown up.
Tips
culture
梭 is the weaver's shuttle that darts back and forth on a loom. 如梭 evokes the rapid back-and-forth motion to describe the swift passage of time. The full idiom 日月如梭 (sun and moon like a shuttle) is very common.